May 3, 2013
It all went terribly wrong
When we look back at the very beginning of the Zombie Apocalypse, it seems obvious that some kind of virus infected our hi-speed reality printer and forced it to begin creating these horrors from the pits of Hades. At the time, we just considered it an amusing malfunction and paid it little attention. Oh well, live and learn, and two years later I think we've mostly exterminated them.